author | Todd Larsen <tlarsen@google.com> |
Fri, 03 Oct 2008 22:17:05 +0000 | |
changeset 269 | 0f1acc4c3e1e |
parent 54 | 03e267d67478 |
permissions | -rw-r--r-- |
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""" |
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HTML Widget classes |
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""" |
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|
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try: |
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set |
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except NameError: |
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from sets import Set as set # Python 2.3 fallback |
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|
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import copy |
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from itertools import chain |
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|
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from django.utils.datastructures import MultiValueDict |
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from django.utils.html import escape, conditional_escape |
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from django.utils.translation import ugettext |
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from django.utils.encoding import StrAndUnicode, force_unicode |
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from django.utils.safestring import mark_safe |
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from util import flatatt |
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|
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__all__ = ( |
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'Widget', 'TextInput', 'PasswordInput', |
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'HiddenInput', 'MultipleHiddenInput', |
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'FileInput', 'DateTimeInput', 'Textarea', 'CheckboxInput', |
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'Select', 'NullBooleanSelect', 'SelectMultiple', 'RadioSelect', |
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'CheckboxSelectMultiple', 'MultiWidget', 'SplitDateTimeWidget', |
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) |
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|
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class Widget(object): |
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is_hidden = False # Determines whether this corresponds to an <input type="hidden">. |
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needs_multipart_form = False # Determines does this widget need multipart-encrypted form |
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|
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def __init__(self, attrs=None): |
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if attrs is not None: |
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self.attrs = attrs.copy() |
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else: |
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self.attrs = {} |
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|
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def __deepcopy__(self, memo): |
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obj = copy.copy(self) |
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obj.attrs = self.attrs.copy() |
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memo[id(self)] = obj |
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return obj |
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|
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def render(self, name, value, attrs=None): |
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""" |
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Returns this Widget rendered as HTML, as a Unicode string. |
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The 'value' given is not guaranteed to be valid input, so subclass |
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implementations should program defensively. |
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""" |
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raise NotImplementedError |
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def build_attrs(self, extra_attrs=None, **kwargs): |
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"Helper function for building an attribute dictionary." |
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attrs = dict(self.attrs, **kwargs) |
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if extra_attrs: |
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attrs.update(extra_attrs) |
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return attrs |
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def value_from_datadict(self, data, files, name): |
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""" |
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Given a dictionary of data and this widget's name, returns the value |
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of this widget. Returns None if it's not provided. |
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""" |
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return data.get(name, None) |
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def id_for_label(self, id_): |
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""" |
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Returns the HTML ID attribute of this Widget for use by a <label>, |
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given the ID of the field. Returns None if no ID is available. |
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|
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This hook is necessary because some widgets have multiple HTML |
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elements and, thus, multiple IDs. In that case, this method should |
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return an ID value that corresponds to the first ID in the widget's |
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tags. |
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""" |
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return id_ |
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id_for_label = classmethod(id_for_label) |
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class Input(Widget): |
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""" |
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Base class for all <input> widgets (except type='checkbox' and |
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type='radio', which are special). |
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""" |
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input_type = None # Subclasses must define this. |
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|
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def render(self, name, value, attrs=None): |
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if value is None: value = '' |
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final_attrs = self.build_attrs(attrs, type=self.input_type, name=name) |
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if value != '': |
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# Only add the 'value' attribute if a value is non-empty. |
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final_attrs['value'] = force_unicode(value) |
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return mark_safe(u'<input%s />' % flatatt(final_attrs)) |
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class TextInput(Input): |
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input_type = 'text' |
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class PasswordInput(Input): |
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input_type = 'password' |
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100 |
|
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def __init__(self, attrs=None, render_value=True): |
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super(PasswordInput, self).__init__(attrs) |
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self.render_value = render_value |
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|
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def render(self, name, value, attrs=None): |
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if not self.render_value: value=None |
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return super(PasswordInput, self).render(name, value, attrs) |
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|
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class HiddenInput(Input): |
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input_type = 'hidden' |
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is_hidden = True |
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112 |
|
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class MultipleHiddenInput(HiddenInput): |
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""" |
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A widget that handles <input type="hidden"> for fields that have a list |
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of values. |
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117 |
""" |
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118 |
def __init__(self, attrs=None, choices=()): |
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super(MultipleHiddenInput, self).__init__(attrs) |
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# choices can be any iterable |
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self.choices = choices |
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122 |
|
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123 |
def render(self, name, value, attrs=None, choices=()): |
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if value is None: value = [] |
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final_attrs = self.build_attrs(attrs, type=self.input_type, name=name) |
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return mark_safe(u'\n'.join([(u'<input%s />' % |
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flatatt(dict(value=force_unicode(v), **final_attrs))) |
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for v in value])) |
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129 |
|
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130 |
def value_from_datadict(self, data, files, name): |
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if isinstance(data, MultiValueDict): |
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return data.getlist(name) |
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return data.get(name, None) |
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134 |
|
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class FileInput(Input): |
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input_type = 'file' |
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needs_multipart_form = True |
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138 |
|
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139 |
def render(self, name, value, attrs=None): |
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return super(FileInput, self).render(name, None, attrs=attrs) |
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141 |
|
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142 |
def value_from_datadict(self, data, files, name): |
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"File widgets take data from FILES, not POST" |
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return files.get(name, None) |
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145 |
|
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class Textarea(Widget): |
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def __init__(self, attrs=None): |
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# The 'rows' and 'cols' attributes are required for HTML correctness. |
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self.attrs = {'cols': '40', 'rows': '10'} |
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if attrs: |
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self.attrs.update(attrs) |
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152 |
|
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153 |
def render(self, name, value, attrs=None): |
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if value is None: value = '' |
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value = force_unicode(value) |
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final_attrs = self.build_attrs(attrs, name=name) |
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return mark_safe(u'<textarea%s>%s</textarea>' % (flatatt(final_attrs), |
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158 |
conditional_escape(force_unicode(value)))) |
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159 |
|
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160 |
class DateTimeInput(Input): |
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input_type = 'text' |
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format = '%Y-%m-%d %H:%M:%S' # '2006-10-25 14:30:59' |
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163 |
|
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164 |
def __init__(self, attrs=None, format=None): |
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super(DateTimeInput, self).__init__(attrs) |
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if format: |
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self.format = format |
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168 |
|
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169 |
def render(self, name, value, attrs=None): |
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if value is None: |
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value = '' |
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172 |
elif hasattr(value, 'strftime'): |
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value = value.strftime(self.format) |
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return super(DateTimeInput, self).render(name, value, attrs) |
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175 |
|
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176 |
class CheckboxInput(Widget): |
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def __init__(self, attrs=None, check_test=bool): |
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super(CheckboxInput, self).__init__(attrs) |
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# check_test is a callable that takes a value and returns True |
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# if the checkbox should be checked for that value. |
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self.check_test = check_test |
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182 |
|
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183 |
def render(self, name, value, attrs=None): |
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final_attrs = self.build_attrs(attrs, type='checkbox', name=name) |
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185 |
try: |
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186 |
result = self.check_test(value) |
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except: # Silently catch exceptions |
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188 |
result = False |
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189 |
if result: |
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190 |
final_attrs['checked'] = 'checked' |
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191 |
if value not in ('', True, False, None): |
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192 |
# Only add the 'value' attribute if a value is non-empty. |
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193 |
final_attrs['value'] = force_unicode(value) |
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194 |
return mark_safe(u'<input%s />' % flatatt(final_attrs)) |
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195 |
|
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196 |
def value_from_datadict(self, data, files, name): |
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197 |
if name not in data: |
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198 |
# A missing value means False because HTML form submission does not |
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199 |
# send results for unselected checkboxes. |
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200 |
return False |
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201 |
return super(CheckboxInput, self).value_from_datadict(data, files, name) |
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202 |
|
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203 |
class Select(Widget): |
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204 |
def __init__(self, attrs=None, choices=()): |
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super(Select, self).__init__(attrs) |
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206 |
# choices can be any iterable, but we may need to render this widget |
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207 |
# multiple times. Thus, collapse it into a list so it can be consumed |
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208 |
# more than once. |
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209 |
self.choices = list(choices) |
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210 |
|
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211 |
def render(self, name, value, attrs=None, choices=()): |
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212 |
if value is None: value = '' |
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213 |
final_attrs = self.build_attrs(attrs, name=name) |
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214 |
output = [u'<select%s>' % flatatt(final_attrs)] |
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215 |
# Normalize to string. |
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216 |
str_value = force_unicode(value) |
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217 |
for option_value, option_label in chain(self.choices, choices): |
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218 |
option_value = force_unicode(option_value) |
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219 |
selected_html = (option_value == str_value) and u' selected="selected"' or '' |
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220 |
output.append(u'<option value="%s"%s>%s</option>' % ( |
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221 |
escape(option_value), selected_html, |
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222 |
conditional_escape(force_unicode(option_label)))) |
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223 |
output.append(u'</select>') |
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224 |
return mark_safe(u'\n'.join(output)) |
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225 |
|
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226 |
class NullBooleanSelect(Select): |
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227 |
""" |
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228 |
A Select Widget intended to be used with NullBooleanField. |
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229 |
""" |
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230 |
def __init__(self, attrs=None): |
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choices = ((u'1', ugettext('Unknown')), (u'2', ugettext('Yes')), (u'3', ugettext('No'))) |
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super(NullBooleanSelect, self).__init__(attrs, choices) |
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233 |
|
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def render(self, name, value, attrs=None, choices=()): |
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try: |
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value = {True: u'2', False: u'3', u'2': u'2', u'3': u'3'}[value] |
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except KeyError: |
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value = u'1' |
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return super(NullBooleanSelect, self).render(name, value, attrs, choices) |
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240 |
|
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def value_from_datadict(self, data, files, name): |
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value = data.get(name, None) |
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return {u'2': True, u'3': False, True: True, False: False}.get(value, None) |
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244 |
|
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class SelectMultiple(Widget): |
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def __init__(self, attrs=None, choices=()): |
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super(SelectMultiple, self).__init__(attrs) |
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# choices can be any iterable |
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self.choices = choices |
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250 |
|
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def render(self, name, value, attrs=None, choices=()): |
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if value is None: value = [] |
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final_attrs = self.build_attrs(attrs, name=name) |
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output = [u'<select multiple="multiple"%s>' % flatatt(final_attrs)] |
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str_values = set([force_unicode(v) for v in value]) # Normalize to strings. |
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for option_value, option_label in chain(self.choices, choices): |
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option_value = force_unicode(option_value) |
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selected_html = (option_value in str_values) and ' selected="selected"' or '' |
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output.append(u'<option value="%s"%s>%s</option>' % ( |
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escape(option_value), selected_html, |
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conditional_escape(force_unicode(option_label)))) |
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output.append(u'</select>') |
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return mark_safe(u'\n'.join(output)) |
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264 |
|
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def value_from_datadict(self, data, files, name): |
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if isinstance(data, MultiValueDict): |
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return data.getlist(name) |
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return data.get(name, None) |
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|
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class RadioInput(StrAndUnicode): |
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""" |
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An object used by RadioFieldRenderer that represents a single |
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<input type='radio'>. |
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""" |
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275 |
|
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def __init__(self, name, value, attrs, choice, index): |
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self.name, self.value = name, value |
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self.attrs = attrs |
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self.choice_value = force_unicode(choice[0]) |
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self.choice_label = force_unicode(choice[1]) |
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self.index = index |
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282 |
|
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def __unicode__(self): |
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return mark_safe(u'<label>%s %s</label>' % (self.tag(), |
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conditional_escape(force_unicode(self.choice_label)))) |
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286 |
|
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287 |
def is_checked(self): |
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return self.value == self.choice_value |
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289 |
|
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def tag(self): |
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if 'id' in self.attrs: |
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self.attrs['id'] = '%s_%s' % (self.attrs['id'], self.index) |
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final_attrs = dict(self.attrs, type='radio', name=self.name, value=self.choice_value) |
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if self.is_checked(): |
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final_attrs['checked'] = 'checked' |
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return mark_safe(u'<input%s />' % flatatt(final_attrs)) |
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297 |
|
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class RadioFieldRenderer(StrAndUnicode): |
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""" |
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300 |
An object used by RadioSelect to enable customization of radio widgets. |
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301 |
""" |
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302 |
|
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303 |
def __init__(self, name, value, attrs, choices): |
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self.name, self.value, self.attrs = name, value, attrs |
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305 |
self.choices = choices |
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306 |
|
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307 |
def __iter__(self): |
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for i, choice in enumerate(self.choices): |
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yield RadioInput(self.name, self.value, self.attrs.copy(), choice, i) |
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310 |
|
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311 |
def __getitem__(self, idx): |
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choice = self.choices[idx] # Let the IndexError propogate |
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313 |
return RadioInput(self.name, self.value, self.attrs.copy(), choice, idx) |
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314 |
|
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315 |
def __unicode__(self): |
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316 |
return self.render() |
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317 |
|
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318 |
def render(self): |
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"""Outputs a <ul> for this set of radio fields.""" |
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return mark_safe(u'<ul>\n%s\n</ul>' % u'\n'.join([u'<li>%s</li>' |
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% force_unicode(w) for w in self])) |
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322 |
|
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323 |
class RadioSelect(Select): |
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renderer = RadioFieldRenderer |
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325 |
|
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326 |
def __init__(self, *args, **kwargs): |
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# Override the default renderer if we were passed one. |
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328 |
renderer = kwargs.pop('renderer', None) |
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if renderer: |
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330 |
self.renderer = renderer |
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331 |
super(RadioSelect, self).__init__(*args, **kwargs) |
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332 |
|
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def get_renderer(self, name, value, attrs=None, choices=()): |
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"""Returns an instance of the renderer.""" |
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335 |
if value is None: value = '' |
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336 |
str_value = force_unicode(value) # Normalize to string. |
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337 |
final_attrs = self.build_attrs(attrs) |
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338 |
choices = list(chain(self.choices, choices)) |
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339 |
return self.renderer(name, str_value, final_attrs, choices) |
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340 |
|
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341 |
def render(self, name, value, attrs=None, choices=()): |
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342 |
return self.get_renderer(name, value, attrs, choices).render() |
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343 |
|
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344 |
def id_for_label(self, id_): |
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345 |
# RadioSelect is represented by multiple <input type="radio"> fields, |
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346 |
# each of which has a distinct ID. The IDs are made distinct by a "_X" |
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347 |
# suffix, where X is the zero-based index of the radio field. Thus, |
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348 |
# the label for a RadioSelect should reference the first one ('_0'). |
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349 |
if id_: |
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350 |
id_ += '_0' |
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351 |
return id_ |
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352 |
id_for_label = classmethod(id_for_label) |
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353 |
|
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354 |
class CheckboxSelectMultiple(SelectMultiple): |
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355 |
def render(self, name, value, attrs=None, choices=()): |
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356 |
if value is None: value = [] |
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357 |
has_id = attrs and 'id' in attrs |
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358 |
final_attrs = self.build_attrs(attrs, name=name) |
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359 |
output = [u'<ul>'] |
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360 |
# Normalize to strings |
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|
361 |
str_values = set([force_unicode(v) for v in value]) |
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362 |
for i, (option_value, option_label) in enumerate(chain(self.choices, choices)): |
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|
363 |
# If an ID attribute was given, add a numeric index as a suffix, |
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|
364 |
# so that the checkboxes don't all have the same ID attribute. |
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|
365 |
if has_id: |
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|
366 |
final_attrs = dict(final_attrs, id='%s_%s' % (attrs['id'], i)) |
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|
367 |
cb = CheckboxInput(final_attrs, check_test=lambda value: value in str_values) |
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|
368 |
option_value = force_unicode(option_value) |
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369 |
rendered_cb = cb.render(name, option_value) |
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370 |
output.append(u'<li><label>%s %s</label></li>' % (rendered_cb, |
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|
371 |
conditional_escape(force_unicode(option_label)))) |
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|
372 |
output.append(u'</ul>') |
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373 |
return mark_safe(u'\n'.join(output)) |
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374 |
|
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|
375 |
def id_for_label(self, id_): |
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376 |
# See the comment for RadioSelect.id_for_label() |
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|
377 |
if id_: |
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|
378 |
id_ += '_0' |
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|
379 |
return id_ |
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|
380 |
id_for_label = classmethod(id_for_label) |
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|
381 |
|
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382 |
class MultiWidget(Widget): |
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383 |
""" |
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384 |
A widget that is composed of multiple widgets. |
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|
385 |
|
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386 |
Its render() method is different than other widgets', because it has to |
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|
387 |
figure out how to split a single value for display in multiple widgets. |
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|
388 |
The ``value`` argument can be one of two things: |
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|
389 |
|
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390 |
* A list. |
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391 |
* A normal value (e.g., a string) that has been "compressed" from |
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|
392 |
a list of values. |
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|
393 |
|
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|
394 |
In the second case -- i.e., if the value is NOT a list -- render() will |
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|
395 |
first "decompress" the value into a list before rendering it. It does so by |
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|
396 |
calling the decompress() method, which MultiWidget subclasses must |
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|
397 |
implement. This method takes a single "compressed" value and returns a |
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|
398 |
list. |
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|
399 |
|
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|
400 |
When render() does its HTML rendering, each value in the list is rendered |
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|
401 |
with the corresponding widget -- the first value is rendered in the first |
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|
402 |
widget, the second value is rendered in the second widget, etc. |
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changeset
|
403 |
|
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|
404 |
Subclasses may implement format_output(), which takes the list of rendered |
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|
405 |
widgets and returns a string of HTML that formats them any way you'd like. |
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|
406 |
|
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|
407 |
You'll probably want to use this class with MultiValueField. |
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|
408 |
""" |
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|
409 |
def __init__(self, widgets, attrs=None): |
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410 |
self.widgets = [isinstance(w, type) and w() or w for w in widgets] |
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|
411 |
super(MultiWidget, self).__init__(attrs) |
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|
412 |
|
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|
413 |
def render(self, name, value, attrs=None): |
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|
414 |
# value is a list of values, each corresponding to a widget |
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|
415 |
# in self.widgets. |
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|
416 |
if not isinstance(value, list): |
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|
417 |
value = self.decompress(value) |
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|
418 |
output = [] |
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|
419 |
final_attrs = self.build_attrs(attrs) |
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|
420 |
id_ = final_attrs.get('id', None) |
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|
421 |
for i, widget in enumerate(self.widgets): |
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|
422 |
try: |
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|
423 |
widget_value = value[i] |
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|
424 |
except IndexError: |
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|
425 |
widget_value = None |
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|
426 |
if id_: |
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|
427 |
final_attrs = dict(final_attrs, id='%s_%s' % (id_, i)) |
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|
428 |
output.append(widget.render(name + '_%s' % i, widget_value, final_attrs)) |
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|
429 |
return mark_safe(self.format_output(output)) |
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|
430 |
|
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|
431 |
def id_for_label(self, id_): |
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|
432 |
# See the comment for RadioSelect.id_for_label() |
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|
433 |
if id_: |
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changeset
|
434 |
id_ += '_0' |
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|
435 |
return id_ |
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Major reorganization of the soc svn repo, to merge into a single App Engine
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|
436 |
id_for_label = classmethod(id_for_label) |
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|
437 |
|
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|
438 |
def value_from_datadict(self, data, files, name): |
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|
439 |
return [widget.value_from_datadict(data, files, name + '_%s' % i) for i, widget in enumerate(self.widgets)] |
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|
440 |
|
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Major reorganization of the soc svn repo, to merge into a single App Engine
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|
441 |
def format_output(self, rendered_widgets): |
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|
442 |
""" |
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|
443 |
Given a list of rendered widgets (as strings), returns a Unicode string |
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|
444 |
representing the HTML for the whole lot. |
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|
445 |
|
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|
446 |
This hook allows you to format the HTML design of the widgets, if |
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|
447 |
needed. |
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Major reorganization of the soc svn repo, to merge into a single App Engine
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|
448 |
""" |
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|
449 |
return u''.join(rendered_widgets) |
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|
450 |
|
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|
451 |
def decompress(self, value): |
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|
452 |
""" |
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|
453 |
Returns a list of decompressed values for the given compressed value. |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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|
454 |
The given value can be assumed to be valid, but not necessarily |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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|
455 |
non-empty. |
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Major reorganization of the soc svn repo, to merge into a single App Engine
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|
456 |
""" |
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Major reorganization of the soc svn repo, to merge into a single App Engine
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457 |
raise NotImplementedError('Subclasses must implement this method.') |
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parents:
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changeset
|
458 |
|
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Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
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|
459 |
class SplitDateTimeWidget(MultiWidget): |
03e267d67478
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parents:
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460 |
""" |
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461 |
A Widget that splits datetime input into two <input type="text"> boxes. |
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Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
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|
462 |
""" |
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parents:
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changeset
|
463 |
def __init__(self, attrs=None): |
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parents:
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changeset
|
464 |
widgets = (TextInput(attrs=attrs), TextInput(attrs=attrs)) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
465 |
super(SplitDateTimeWidget, self).__init__(widgets, attrs) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
466 |
|
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
467 |
def decompress(self, value): |
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Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
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changeset
|
468 |
if value: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
469 |
return [value.date(), value.time().replace(microsecond=0)] |
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Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
470 |
return [None, None] |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
471 |